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N-PETERS, FHDTO-LITHOGRAPNER. WASHINGTON, D, O

UNITED STATES PATENT OFFICE.

LEO SOHULER, OF ASTORIA, NEW YORK.

JEWEL-SETTING TOOL.

SPECIFICATION forming part of Letters Patent No. 237,052, dated January 25, 1881.

Application filed December 15, 1880. (No model.)

To all whom it may concern:

Be it known that I, LEO SCHULER, a citizen of the German Empire, residing at Astoria, in the county of Queens and State of New York, have invented new and useful Improvements in Jewel-Setting Tools, of which the following is a specification.

This invention relates to tools for swaging or burnishin g down the lip of the setting over the edge of a jewel after it has been dropped into its place, in order to fasten the jewel; and it consists in the combination of a hollow shank adapted to receive a revolving motion, adjustable swaging-arms projecting from the hollow shank at one end, a loose centeringneedle fitted into the hollow shank, and a spring arranged in the hollow shank to act upon the centering-needle with a tendency to force the same outward, so that if the point of the centering-needle is inserted into the hole of the jewel to be set the needle readily adapts itself to the size of such hole, thereby centering the tool, and it is not liable to break the jewel.

This invention is illustrated in the accompanying drawings, in which Figure 1 represents a longitudinal central section. Fig. 2 is a side view. Figs. 3 and 4 show the jewelsetting.

Similar letters indicate corresponding parts.

The letter A designates the hollow shank; B, the adjustable swaging-nrrns; G, the centering-needle, and D the spring.

In order to adapt the hollow shank A for receiving a revolving motion a pulley, 10, is formed or secured thereon, near its upper end, where it is closed.

The swaging-arms B project from the hollow' shank A at its lower end, where it is open,

therefrom, so that it is capable of sliding therein, and the spring D is arranged above the centering-needle in the shank, so that it acts on the needle with a tendency to force the same outward. The motion of the centering-needle G is regulated by a screw-stop, 14, passing through the side of the shank A and engaging a groove, 15, in the needle, this stop serving also to prevent the rotation of the needle and to hold the same in a fixed position, when it is desirable, as in adjusting the swagingarms B.

In applying the tool to use the swagingarms B are first set to the proper distance from each other and then placed astride of the jewel, previously dropped into its place in the setting with the centering-needle O inserted into the hole of thejewel, and the arms pressing on opposite sides of the lips 16, Figs. 3 and 4. A revolving motion is then imparted to the tool in any usual or suitable manner, when, by the action of the arms B, the lip 16 is swaged or burnished down over the edge of thejewel, and the latter is firmly secured in the setting.

It will be readily perceived that the centerin g-needle O at once adapts itself to the hole of a jewel, (the size of which varies,) and hence I not only save the labor of adjusting the needle, but also effectually avoid the danger of breaking thejewel by its pressure.

What I claim as new, and desire to secure by Letters Patent, is

In a tool for setting jewels, the combination of a hollow shank adapted to receive a revolving motion, adjustable swaging-arms projecting from the hollow shank at one end, a loose centering-needle fitted into the hollow shank, and a spring arranged in the hollow shank to act on the centering-needle with a tendency to -force the same outward, the whole adapted for E. F. KASTENHUBER. 

